Improvement in furnaces for soldering tin cans



GEonGE'w. FISHER.

Improvement in Furnaces for Soldering Tin-Cans.

No. 126,685. V Patentednaymnm.

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UNITED STATES ATENT FFICE.

GEORGE w. FISHER, or BALTIMORE, MARYLAND.

Speciiicaton forming part of Letters Patent N o. 126,685, dated May 14,1872.

To all whom it may concern.-

Be it known that I, GEORGE W. FISHER, of Baltimore, in the county of Baltimore and State of Maryland, have invented certain new anduseful Improvements in a Heating-Furnace for Floating Tin Gansand other articles and vessels of tin manufacture; and the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing making a part of this specification, in which- Figurel represents a front view of the furnace, showing draught-holes and regulating damper-end doors open-the heating-irons, rods, and pedals for operating the same. Fig. 2 is an end view of the same, showing the cooling-table in the rear of the soldering or heating-irons. Figf shows a plan or top view of the floating-irons and pedals for operating them and the cooling-tabl@ Fig. 4 shows a sectional end view through the furnace at a: x. Fig. 5 shows the draught damper and heat regulator in the rear of the floatingirons, as it is arranged to operate at w. Fig. 6 shows a broken off rear view of the adjustable cooling-table, above the smoke or draught-pipe and closing damper.

The object of my invention is to facilitate the manufacture of tin cans, cups, Svc.; and it consists in the construction of the furnace for heating and iioating the solder to secure the vtops and bottoms of tin cans air-tight, and the apparatus for regulating the heat on the series of movable floatingirons, and the cooling-table and xtures for operating and manipulating the cans during the process, as will be hereinafter more fully described.

Referring tothe drawings, the mainportion or body of the furnace A, may be made of sheet or cast-iron, in the form of a box- 'stove of such dimensions as to be convenient in height to perform the process of floating the refbox B, being in the upper portion separated by a grate, b, from the ash-pitC, which is provided with doors D at one or both ends, as desired, as also the fire-box above it, for the purpose of supplying it with necessary fuel. On one or more of the sides of the box, just below the grate b, are series of holes e e, having sliding dampers to open or close them to admit air for draught. Above the front nre-brick g is another series of holes, c c, provided with a sliding damper, f, to close them or admit a current of cold air, which is thrown up by a plate, h, directly onto the under side of the front ends of the iioating-iron I I so that the heat in them can be regulated to a nicety4 to iiow the solder, as fast and no faster than is required, the heat being confined or acting immediately under the central portion of the iioating-irons I I, there being another plate, 7c, on the rear side over the lire-box, and also partitions in the flue leading therefrom to the smoke-pipe E, with sliding dampers i t' to draw the heat around under the end oatingirons when necessary to make the heat uniform on the whole series, four or more in number, as desired. Theoating-ironsII are made with recesses J in the top with ledges or offsets' j, to it the different size cans or vessels to be soldered, with blocks cast to fit into them to make the bottomsl flush with the ledges j for .Y Vthe larger size cans so that they bear on their f whole surface while heating. The irons I are hinged at their rear ends, and are inclined forward while at rest on the furnace, and are pro-'1 vided, each one, with a pedal, fm, and vertical rod a, so as to lifted by the action of the foot to a level with the cooling-table F placed in their rear, so that the cans can be moved off the floating-irons onto the cooling-table without danger of slipping, or the bottoms being moved from their position. The cooling-table F may be made of any substance-cast or sheet metal-with a space underneath for the free circulation of air, or of a non-conductor of heat, there being means provided whereby it can be adjusted to a level with the ledges j on the iioating-irons I, as the different-sized cans are bein-g manipulated, so that there is no I I jar or danger of unsoldering the can.

The operation of soldering the tops and bot toms onto tin cans, &c., technically termed floatin g, is as follows: The cylindrical part of the can being soldered, the ends havin gaflange struck up to fit over, are charged with muriate of zinc and a piece of solder, and are placed on the cylinder and then placed on the cooling-table F; the furnace being heated they are slid onto the fioatingirons I, and stand until the solder melts, when it is turned around by the hand until ithas flowed up through the joint all round, and is kept turning While the iron I is brought up to a level, when it is moved olf on the cooling-table to set, and then removed.

What I claim as my invention isl. A floating furnace having a series of hinged or movable floating-irons', I I, the same being provided with ledges j j to receive various size cans, in combination with the pedal fixtures m and n, and the cooling-table F, all constructed to operate substantially in the manner as and for purposes set forth.

2. The arrangement of the dampers f andi z', with the plates h and k t o form fines for regulating the heat of the oating-irons I I uniformly, substantially as herein shown and described.

In testimonyr whereof I hereunto subscribe my name.

GEO. W. FISHER. Witnesses:

J. B. WOODRUFF, A. L. YOUNGS. 

